I found the version II of the 58mm f/1.4 to be so good, especially wide open, that I got rid of my Nikon 50mm lenses. That included the 50mm 1.2 AIS (too much barrel distortion), and a 50mm 1.8 AI. The latter was pretty good, but it has lower contrast wide open compared to the Voigtlander, and the Nikon 1.8 has noticeable barrel distortion when not at infinity. The only Nikon 50mm that I kept was the f/2.8 AIS Micro.
The only thing lacking on version II was the meter coupling prong to mate with my FTN meter on my F. It looks like the new version is the answer to my problem.
As far as quality of construction goes, I see nothing in the version II to indicate that the construction was anything less than first class. It is ALL solid metal and glass. No plastic that I can see.